Internal-combustion engine



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2 Sheets-Sheet 1 Filed Nov. 18

Dec. 4 1923.

F. S. DUESENBERG INTERNAL COMBUSTION ENGINE 2 Sheets-Sheet '2 Filed Nov. 18, 1920 Patented Dec. 4, 1923.

UNITED STATES II?'.B.EIJII"'.|BIICK 8. DUESENBERG, F ELIZABETH,

INTERNAL-COMBUSTION ENGINE.

Application filed November 18, 1920. Serial No. 424,998.

This invention relates to internal combustion engines and is more especially concerned a as Fig. 3 on line with novel provisions for the cooling of. the spark plug or plugs and provisions to facilitate access to the combustion chamber or chambers, the removal of carbon therefrom and the grinding. of the valves.

Myinvention will be best understood by reference to the following description when taken in connection with the accompanying. pose drawings of one illustrative embodiment thereof, while its scope will be more particularly ointed out in the appended claims.

In t e drawings:

Fig. 1 is a side elevation of a port on of an internal combustion engine exempllfymg an invention;

Fig. 2 is a side elevation on an enlar ed scale of the upper portion of the cylln ers showing the same as they a an when the water acketed cover containing the spark plu is dismounted; I

ig. 3 is a sectional v1ew on a still larger scale on line 3-3 of Fig. 1;

Fi 4 is a sectional viewon the same scale 4--4 of Fig. 1; Fig. 5 is a sectional view on a reduced scale on line 5-5, of Fig. 4; and

Fig. 6 is a vertical sectional view on an enlarged scale of the upper portion of the engine in a plane containing the axls of one of the valves.

Referring to the drawmgsand to the embodiment of my invention which I have selected for exemplification, I have shown an internal combustion engine having a crank case 8 surmounted by one or more, herein a luralit of cylinders 10, herein cast on boc a 'acket 12 about thecylinder heads and walls. in the present example, each cylinder has a head 14 cast integral therewith and provided with a combustion chamber 16, which is elongated in the direction of the length of the cylinder, and inlet and exhaust orts 18 controlled by inlet and exhaust va ves 20,

provided with. a water.

and to permit the latter to be round as well as to facilitate the removal 0 carbon from the combustion chambers. These several openings 22 are closed by a removable cover 24, herein serving also as a mounting for usual spark plugs 26 threaded thereinto, the electrodes of the plugs being presented within the combustion chambers, respectively. The cover is secured to the cylinder casting by a (plurality of studs 28 threaded into the cylin er castin extending through the cover and provi ed with nuts 30, removal of which permits the cover to be dismounted, thereby to afiord access to the combustion chambers and valves. ,A gasket 32 interd between the cylinder casting and cover prevents leakage at the joint between them.

An important feature of myinvention is the rovlsion of a water jacket space 34 within the cover and surrounding the spark lugs. Water enters this jacket throu h an inlet 36 and leaves by way of an out et 38 (see Figs. 2 and 5), the latter dischar ing into the main water jacket 12 which is a ut the cylinder heads and sides. Thus the water which is discharged into the main water jacket at one end of the cylinder block passes over all of the cylinders in succession throu h a single water chamber, and prevents the ormation of any steam pockets which are a t to form in other systems where water is en in at more than one inlet. The advantage is that with the elimination of steam pockets, the cool' efl'ect is substantially uniform. Prefera' ly the inlet 36 is adjacent one end of the cover and the out.-

let-38 adjacent the other end. The main water jacket l2 discharges throu h a usual outlet 40 to a customary radiator not shown herein). Cooling water is supplied to the inlet by suitable means, herein a usual pump 42 havin an inlet 44. It should now be evident t at the cool water drawn from the bottom of the radiator bythe pump is dischar by the latter into the water jacket for e spark plugs, thus cooling the latter thoroughl before passing to the main water jacket. his is importantfor several reasons, the principal one being that the spark plug porcelains are revented from becommg redhot and causing pie-ignition. Since rod 48 to a usual crank-shaft (not shown).

Each valve is provided with a valve stem 50 working in a guide 52, herein transverse to the longitudinal axis of'the cylinder. A usual spring 54 encircling the valve stem bears at one end against a fixed abutment 56 and at the other end against-an abutment 58 in the form of a collar secured to the valve stem. The valve is opened in opposition to the, sprin by suitable valve actuati mechanism, erein a lever 60 fulcrum at 62 and having two arms 64 and 66, one engaging the outer end of the valve stem and the other cooperating with a usual cam 68 on the cam-shaft 70, the turning of which is- ,accomp-anied by roclnng movement of the lever and opening and closing of the valve in a well-known manner.

Haviug thus described one embodiment of my invention, but Without limiting myself thereto, what I claim and desire by Letters Patent to secure is:

1. In an internal combustion engine, the combination of a cylinder and a piston working therein, valve means to control the admisslon of the fuel charge to and the exhaust of'the products of combustion from said cylinder, a spark plug to ignite the fuel charge in the cylinder, and cooling means having provision to direct a cooling medium serially first about the spark plug to the exclusion of said valve means and subsequently about said valve means a 2. In an internal combustion engine, th combination of a cylinder and a piston working therein, valve means to control the admission of the fuel charge to and the exhaust of the products of combustion from said 0 linder, a spark plug to ignite the fuel -c arge in the cylinder, and cooling means including a jacket about said spark plug, a jacket about said valve means, and means to cause a stream of cooling fluid to be directed first through the first-mentioned jacket and subsequently through the second-mentioned jacket.

3. In an internal combustion engine, the

names"? combination of a plurality of cylinders and pistons working therein, valve means to control the admission of the fuel charge to and the exhaust of the products of combustion from said cylinder, a plurality of spark plugs to ignite the fuel charges in said cylinders, respectively, and cooling means having provision to direct a cooling medium first about the spark plugs, successively. to the exclusion of said valve means and subsequently about said valve means.

4. In an internal combustion engine, the combination of a plurality of cylinders and pistons working therein, valve means to controlthe admission of the fuel charge to and the exhaust of the products of combustion from said cylinders, a plurality of spark plugs to ignite the fuel char es in said cylinders, respectively, and coo ing means mcluding a spark plug jacket having an inlet and an outlet, and a acket having an inlet communicating with said outlet and leading thence about said valve means.

5. In an internal combustion engine, the

combination of a cylinder and a piston working therein, valve means to control the admission of the fuel charge to and the ex haust of the products of combustion from said cylinder, a spark plug to ignite the fuel charge in said cylinder, and a cooling s stem including a pump whose outlet ischarges a cooling medium first about said spark plug to the exclusion of said valve means, and conduit means to conduct the cooling medium thence about said valve means. i 6. In an internal combustion engine, the combination of a cylinder and a plston working therein, valve means to control the admission of the fuel charge to and the exhaust of the products of combustion from said cylinder, a spark plug to ignite the fuel charge in said cylinder, and acooling system includin a pump and means to enforce a flow of tfie cooling medium from said pump first about said spark plug to the exclusion of said valve means, and thence about said valve means.

In testimony whereof I have signed my name to'this specification FREDERICK S. DUESENBERG. 

